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An alternative astronomical calibration of the lower Pleistocene timescale based on ODP Site 677
Tập 81 Số 4 - Trang 251-261 - 1990
ABSTRACTOcean Drilling Program (ODP) Site 677 provided excellent material for
high resolution stable isotope analysis of both benthonic and planktonic
foraminifera through the entire Pleistocene and upper Pliocene. The oxygen
isotope record is readily correlated with the SPECMAP stack (Imbrie et al. 1984)
and with the record from DSDP 607 (Ruddiman et al. 1986) but a significantly
better match wit...
The Devonian tetrapodAcanthostega gunnariJarvik: postcranial anatomy, basal tetrapod interrelationships and patterns of skeletal evolution
Tập 87 Số 3 - Trang 363-421 - 1996
ABSTRACTThe postcranial skeleton ofAcanthostega gunnarifrom the Famennian of
East Greenland displays a unique, transitional, mixture of features
conventionally associated with fishand tetrapod-like morphologies. The
rhachitomous vertebral column has a primitive, barely differentiated atlas-axis
complex, encloses an unconstricted notochordal canal, and the weakly ossified
neural arches have poorly ...
Cretaceous foraminiferal morphogroup distribution patterns, palaeocommunities and trophic structures: a case study from the Sergipe Basin, Brazil
Tập 81 Số 3 - Trang 221-246 - 1990
Foraminiferal studies have been used in palaeo-environmental reconstructions of
the marine Cretaceous succession (upper Aptian to Maastrichtian) of the Sergipe
Basin, in northeastern Brazil. The foraminiferal assemblages show broadly three
types of response to changes in environment: (1) variations in morphotypes of
the taxa present; (2) changes in specific and generic diversity; and (3) changes
i...
Regional framework and geodynamic evolution of the Indus-Tsangpo suture zone in the Ladakh Himalayas
Tập 72 Số 2 - Trang 89-97 - 1981
ABSTRACTThe Indus-Tsangpo suture and its adjoining tectonic zones are well
displayed in the Ladakh Himalayas where four tectonic zones have been
distinguished, viz. the Zanskar, Indus suture, Shyok suture and Karakoram zones.
The Zanskar zone is made up of Precambrian basement of the Zanskar crystalline
complex and overlying Phanerozic sediments including Upper Palaeozoic volcanic
rocks of the Zan...
Distribution of anatomically-preserved floras in the Lower Carboniferous in Western Europe
Tập 75 Số 3 - Trang 311-340 - 1984
ABSTRACTTwelve localities of Lower Carboniferous strata in Scotland (Loch
Humphrey Burn, Glenarbuck, Pettycur, Oxroad Bay and the Berwickshire localities
of Cove, Burnmouth, Gavinton, Edrom, Foulden) and in France (Esnost, Roannais,
Montagne Noire) have been investigated with particular regard to their
anatomically preserved floras. New data on the composition and preservation of
the assemblages, ...
Collision zone between the Kohistan arc and the Asian plate in NW Pakistan
Tập 76 Số 4 - Trang 463-479 - 1985
ABSTRACTThis paper describes the suture zone between the Asian plate and the
accreted Kohistan island arc in the Chitral district of NW Pakistan.The southern
part of the Asian plate consists of two tectonic units separated by the
N-dipping Reshun fault. The northwestern unit comprises Devonian carbonates and
quartzites overlain by Devonian to Permian shales and slates with some
limestones (Lun sha...
Exploring the plutonic-volcanic link: a zircon U-Pb, Lu-Hf and O isotope study of paired volcanic and granitic units from southeastern Australia
Tập 97 Số 4 - Trang 337-355 - 2008
AbstractThe relationship between plutonic and volcanic rocks is central to
understanding the geochemical evolution of silicic magma systems, but it is
clouded by ambiguities associated with unravelling the plutonie record. Here we
report an integrated U-Pb, O and Lu-Hf isotope study of zircons from three
putative granitic-volcanic rock pairs from the Lachlan Fold Belt, southeastern
Australia, to e...
A new large lamniform shark from the uppermost Gearle Siltstone (Cenomanian, Late Cretaceous) of Western Australia
Tập 90 Số 1 - Trang 49-66 - 1999
AbstractAn association of 100 teeth and 15 vertebrae from a large, lamniform
shark, is described from the uppermost part of the Gearle Siltstone in the
Giralia Anticline, Southern Carnarvon Basin, Western Australia. The material
represents a new genus and species: Cardabiodon ricki. The taxon is referred to
the new family Cardabiodontidae on the basis of its dental formula and uniquely
oversized l...
Experimental taphonomy: silicification of plants in Yellowstone hot-spring environments
Tập 94 Số 4 - Trang 503-521 - 2003
ABSTRACTDuring experiments conducted within the vent pool of Medusa Geyser,
Norris Geyser Basin, Yellowstone National Park, USA, amorphous opaline silica
(opal-A) was deposited on/within plant tissues within 30 days of immersion.
Initially, deposition created inter/intra-cellular films which lined cell walls
plus intercellular colloid suspensions (sols) of opal-A nano/microspheres. By
330 days, op...
Structure, generation and preservation of upward fining, braided stream cycles in the Old Red Sandstone of Scotland
Tập 71 Số 1 - Trang 29-46 - 1980
ABSTRACTA sequence of upward fining cycles contain braid bar structures in the
coarse member. Bars, medially placed in the stream are recognised either by
radiating large foresets or by identifying bar tail sediments with converging
dips to their foresets. Lateral bars are recognised by the growth of major
sandstone sheets oblique to the direction of channel trend and over slough
mudstone. The fin...